Plaster bandage forming machine



July 13, 1948. J. R. PAVA 2,445,078

PLASTER BANDAGE FORMING MACHINE Filed July 14, 1945 v mmvron Jive/ 1?. 1 av c1 XUNlTE D STATE Patented July 13, 1948 137*.

, 2,445,078 I r PLAS'IER BANDAGE FORMING MACHINE Jack R. Pava, Santa Barbara, Calif., assignor of one-half to Douglas F. Pincock, Santa Barbara,

Calif.

' ApplieationJuly 14, 1945, Serial No; 605,143

: 9 Claims. (Cl. ill-32) This invention has to do withdevicesfor forming plaster bandages-that is, fabric or gauze bandages impregnated with suitable powdered material suchas plaster of Paris.

Such plaster bandages are initially formed by impregnating loosely woven fabricor gauze strips, such as crinoline, with plaster of Paris in dry powdered form, the impregnated strip being then formed into a roll until ready for use. Just before application and use the strip is then thoroughly wetted, sothat after being applied the plaster of Paris will set.

While machines for impregnating and rolling such bandages have been proposed, so far as I am aware they have possessed disadvantages. They comprise,- generally-a feedroll to carry the roll of impregnated fabric, a receiving roll upon which the impregnated fabric is rolled, and means for guiding the fabric through a body" of powdered material. Many of the difliculties presented by prior art deviceshave arisen: from their rather inefficient and cumbersome guide means for the fabric; from the difficulty of threading the fabric strip through the machine without disturbing the powdered material; from thelack of proper or eflicient means of confining the area of the pile of powdered material and preventing it from becoming too scattered; Another difficulty has been that there is too great resistance to movement of the fabric strip through the machine. I It is among the objects'of my present invention to provide a plaster bandage formingmachine embodying novel and'eflicient'me'ans for guiding the fabric strip'over the surface of a pile of powdered material, such as plasterof Paris, positioned between the feed and receiving rolls.

It is another object of my invention to-provide a bandage forming machine wherein the fabric strip may be threaded or inserted with maximum ease and speed withoutin any way disturbing the pile of powdered material;

One of the more specific objects'ofthe invention is to' provide in such a machine means for yieldably retaining the'fabric strip in tension so that it will have such pressural engagement with a'pile of powdered material thatthe' inters'tices of the fabric will become thoroughly filled with the material.

Another object of my invention'reside's in the novel arrangement of the fabric guiding and retaining parts which prevents undue scattering of the powdered'material as well as enables repiling of the powdered'materialby tipping the casing;

"A still further object is the provisiorr'of a ma-' chine which, while effectively guiding the fabric strip through the machine in proper pressural engagement with the powdered material, does not offer undue resistance to movement of the strip.

5 Other more specific objects and advantages will appear from the following description wherein I shall describe a presently preferred embodiment of the invention, making reference to the accompanying drawings, in which:

Fig. 1 is a longitudinal section;

Fig. 2 is a top plan view with the fabric strip removed; and p Fig. 3 is an enlarged fragmentary view showing one of the bearings for the receiving roll.

Referring now to the drawings, the numeral 5 denotes a rectangular, box-like, open-topped casing having a bottom wall 5a, side walls 5?) and end walls 50. Across bar 1 of round cross-section is mounted at its ends in brackets 8, secured to the respective side walls 5b, and rotatably mounted upon the bar I are two swingable arms l0, each having adjacent its outer end a slot II to rotatably receive the reduced diameter portion of feed roll mounting members l2, which latter are inserted in the opposite ends of the core l5a of the fabric roll IS in coaxial alinement so that the roll and the members l2 may rotate about a common axis relative to the arms 10. The arms l0 may be swung about the bar 1 and, when in position of use as shown in the drawings, the roll l5 overhangs the left-hand end wall of the casing, the arms l0 having feet I'Oa to engage the outer surface of the end wall of the casing.

A receiving roller 20 is journaled to rotate 5 about-an axis parallel to the axis of roll l5 and transversely of the opposite end of the casing, being comprised of rods 2|, here shown as four in number, secured at their ends in discs 22, each of which discs carries a trunnion 23 journaled in 40 hearing members '24, 24a, secured to the opposite sides of the casing. Bearing member 24 is open at its top (see Fig. 3) so that the roll 20 may be inserted and removed from the casing. Spring pressed pivoted detents 25 retain the trunnion within the bearing when the device is in use, being urged into such retaining positionby leaf springs 21. To the last-mentioned trunnion there is secured a crank 26 by which the receiving roller is manually rotated.

56 nected at their'other ends to the brackets 8 so'.

wardly from its positionas shown 'inFig. Into."

facilitate threading the fabric strip through the machine. arms 42 and extending transversely of.the.cas=

Secured at it respective ends to the;

ing, there is a plate 50, said plate being disposed diagonally downwardly and outwardly,- as: best: This plate: prevents powdered.

shown in Fig. 1. material from escaping towards the left-hand end of the casing and also permits the materiaLto be easily re-piled by simply tipping the casing.

Reinforcing rods 52 are secured at their? respec-.

tive ends to the arms 42.

Between roller 40 and roller Ell Iprovidea-pair of; arms 60 which are piyotallysecured ati their inner endsto brackets: 62- on the sides- 5b..- These armsacurve downwardly at their. outer ends into a somewhat hooked shape andghave securedthereto a transversely-disposedstripper plate: 6.5,- the bottom edge. of which plateis rounded in crosssection: as shownat 65a. Thusthe. arms 60 and.

or.. bottom' wallof the casing; and the fabric'str-ip.

S from the roll l5" isdragged over the top surface of this pile'ofmaterialby means of the-roller 29: Thestr-ip Spassesfrom-the roll l5first-.over roll 3.0,.thence over rol1'4fi; thence-over the top. surfaceof the pile' of material, thence under the rounded bottom edge- 65a of the stripper plate, thenceover the roller-l0,- beingsecured at itsend tolthe. receiving roll 29 sothat as the-crank. 26 is turnedit causes the stripto be wound about the b ars zi and thus dragged over the surface of the; pileof material M. Theweight of roller Mland. the arm assembly upon which it is mounted-is sufiicient to'maintain the fabric strip S in.- con.- tactwith the' material at least. throughout the surface of one portion: of: thepile M,, while the. stripper plate this. ofz'aweight tom'aintainthe.

strip against. the remainder. of the surface. of. the.

pileof material.

Since one-half. of. the surface of roller. GIT-has right-hand. and the. other half' has. left-hand; threads on corrugations, and the fabric's t'rip is compressed between. roller 30 and the relatively softrubber roller 40,.the. strip is positively'maint'ained'in a line. As the stripis thus dragged over the surfa'ce' oi the" powdered material the interstices become thoroughly filled; and 'any" excess will be stripped off by-the stripper plate surface" BSa': It" will be observed" that the pile of mate;- rial M is therefore confi'ned between the plate- 50 and the stripper plate 6& i

Tenn: the machine; the powderleda plaster. .of Paris is first deposited: on? the" floor;- Then: the arms: 311:, 421and: Bi]: are'swung', upwardlyi. The fabric strip 'is then passe dvoverrollers- 3d: and: 10,. after whiclrrthe: arms 42' arevswung: downwardly:

to bring roller 40 into the illustrated position, and arms are likewise swung downwardly to cause the stripper plate to press the strip against the floor, the free end of the strip being secured to the roller 20. Then arms 31 are lowered to cause roller 30 to press the fabric strip against the soft roller 40. Thus as crank 26 is turned, the'strip is; wound abouti roller 20-; causing the strip-tube dragged overntl'ietopsurface of the powdered material. As the powdered material is used up, the roller 40 and stripper plate 65, which pressthestrip. against the floor at opposite sides of'tlie pileoffmaterial, maintain the strip in conforming engagement; against the top surface of the-pile";

I claim:

1..A-.-machine..f.or impregnating a fabric strip with powdere'd" material, comprising: a casing havingaifioor adapted to support a pile of dry, powdered material, means for moving a strip of fabric: along.the;-casing, and meanssforrmaintainme; said.- strip! in tension. throughout its contact with the :top surface of thepile.QfLmateriaI-during said movement, said-.- last-named means comprising,; a vfirst pair of armspivotallyconnected: to thez-casing; towswing. towards -andawayxfrom the floor of the-casing, a.guide membencarried bythe. outer end? pcrtionsq-ofithev arms: for. engagement with: the fabric-strip; adjacent one. side of. the pileof material; a material confining2 plate. car-- ried byrsaid arms; a-lsecond-zpair of arms pivotally connected to the casingto. swing towards-end awayfrom'the fioor. ofthe casing, .anda stripper plate carried by the outer. endsof: the. last-named. armsforengagement .1 with the. fabric. strip at the. oppositeiside of= thepile ofymaterial, said. first-pain of arms-being'swingable independently; of thesece ond pairaoftarms v 2-. Anmachine: forimpregnating a fabric. strip with powdered.-ma"teria1;, comprising: i a casing having aw fiooradaptedto. suppcrt-.-a. pile .of-dry, powdered. material, means formoving a strip of. fabric alongythe; casing; andlmean's :formaintain.-

ing; said-strip. in. tension: throughout-itscontactwith:the. top ,surfacewof the-pile of. material. during said movemer-rt; said last-named meanseomev prisinga pressure apply-ingr memberyieldabl-y. bearing. against athe. strip. adjacent one; side. of thepileof,- material .a pair ofparalleh guide. rollers adjacent the opposite-s-ide-of the: pile. of -ma.-

. terial, andtmeans-rotatably mounting, each roller for swing-ing'movement relative totheothen said. rollersbeing; adaptedto: receive. and: yieldably compress therstriptherebetweem.

3.-.A machineefori.impregnating-a fabric. strip with; powdered material, comprising: -a.,casing having; a; floor: adapted \to support a-lpile of?- dry, powdered-f: material, means. fora-moving a. strip of fabric along. the casing, 53nd means f or. main? tainingisaidstrip instension .throughout ,.-its con tact with the toptsurfaceeof the.pileof=material during said? movemenhysaid. lash-named. means comprising aipressureeapplying member .yieldably bearing against; the. strip, adjacent] one sideof thepilebt material, a pair-oftparallel. guide .IOll-r ersn adjacent-the opposite.-'side- 0fthepile of ma: terial, andzmeans .rotatably mounting..each roller for swinging movement relative gtmthepthen, said rollersbeing adapted to. receiver and. yieldably compress-thestrip .therebetweenuone. ofthe .-ro1l.-. ershaving right-handithreadseinhalfits periphe era] surf-ace left-.hand, threads .inthelother ha'lf ofiitsperipheralsurfacew 4. A machine for impregnating a fabric. strip. with powdered. material; comprising; a. casing having a floor adapted to support a pile of dry, powdered material, means for moving a strip of fabric along the casing, and means for maintaining said strip in tension throughout its contact with the top surface of the pile of material dur-- ing said movement, said last-named means comprising, a pressure-applying member yieldably bearing against the strip adjacent one side of the pile of material, a pair of parallel guide rollers adjacent the opposite side of the pile of material, and means rotatably mounting each roller for swinging movement relative to the other, said rollers being adapted to receive and yieldably compress the strip therebetween, one of the rollers having right-hand threads in half its peripheral surface and left-hand threads in the other half of its peripheral surface, and the other of said rollers having a soft peripheral surface.

5. A machine for impregnating a fabric strip with powdered material, comprising: a casing having a floor adapted to support a pile of pow dered material, power-actuated roller means journaled in the sides adjacent one end of the casing for longitudinall moving a fabric strip along the casing, means for feeding the strip into the other end of the casing, and means for guiding and tensioning the strip over the top sur-- face of the pile of material, the last-named means comprising a pair of rollers rotatably and yieldably mounted adjacent the last-named end of the casing to pass and compress the strip therebetween and a stripper plate mounted in the casing for yieldable engagement with the strip adjacent the other end of the casing.

6. A machine for impregnating a fabric strip with powdered material, comprising: a casing having side walls and a floor adapted to support a pile of powdered material, power-actuated roller means journaled in the sides adjacent one end of the casing for longitudinally moving a fabric strip along the casing, means for feeding the strip into the other end of the casing, and means for guiding and tensioning the strip over the top surface of the pile of material, the last-named means comprising a pair of arms pivotally connected to the side walls to swing towards and away from the floor, a guide roller rotatably carried by the outer ends of the arms for yieldable engagement with the strip at one side of the pile of material, a material-confining plate carried by said arms, a second pair of arms pivotally connected to the side walls, to swing towards and away from the floor and a stripper plate carried by the outer ends of the last-named arms for yieldable engagement with the strip at the opposite side of the pile of material.

'7. In a device having a feed roller adapted to carry a fabric strip and a power-actuated receiving roller adapted to pull said fabric strip from the feed roller, means adapted to be positioned between the rollers for guiding said fabric strip comprising a pair of parallel guide rollers adapted to compress the strip therebetween, one of said guide rollers having right-hand peripheral threads throughout one-half its length and lefthand peripheral threads throughout the other half of its length.

8. In a device having a feed roller adapted to carry a fabric strip and a power-actuated receiving roller adapted to pull said fabric strip from the feed roller, means adapted to be positioned between the rollers for guiding said fabric strip comprising a pair of parallel guide rollers adapted to compress the striptherebetween, one of said guide rollers having right-hand peripheral threads throughout one-half its length and lefthand peripheral threads throughout the other half of its length, and the other of said guide rollers having a soft peripheral surface.

9. In a device for impregnating a fabric strip with powdered material, a casing having a floor adapted to support a pile of dry powdered material, means for moving a strip of fabric along the casing, and means for maintaining said strip in tension throughout its contact with the top surface or" the pile of material during said movement, said last named means including a pressure applying member yieldably bearing against the strip adjacent one side of the pile of material, a guide member adjacent the opposite side of the pile of material, a material confining plate adjacent said guide member, and means yieldably supporting said guide member and said plate.

JACK R. PAVA. 

